src/edu/berkeley/fleet/ies44/InstructionEncoder.java

   1 package edu.berkeley.fleet.ies44;
   2 import edu.berkeley.fleet.api.*;
   3 import edu.berkeley.fleet.*;
   4 import edu.berkeley.fleet.util.*;
   5 import java.io.*;
   6 import static edu.berkeley.fleet.util.BitManipulations.*;
   7 import static edu.berkeley.fleet.api.Instruction.*;
   8 import static edu.berkeley.fleet.api.Instruction.Counter.*;
   9
  10 public abstract class InstructionEncoder {
  11
  12     public static final int WIDTH_WORD             = 37;
  13     public static final int WIDTH_ADDR             = 11;
  14     public static final int WIDTH_CODEBAG_SIZE     = 6;
  15     public static final int WIDTH_COUNTER_LITERAL  = 6;
  16
  17     public static final Mask FLAGS                = new Mask("...............000000................");
  18     public static final Mask FLAGS_A              = new Mask("...............000000vvvvvvvv........");
  19     public static final Mask FLAGS_B              = new Mask("...............000000........vvvvvvvv");
  20     public static final Mask REPEAT_FROM_DATA     = new Mask("...............000001........00......");
  21     public static final Mask REPEAT_FROM_LITERAL  = new Mask("...............000001........10vvvvvv");
  22     public static final Mask REPEAT_FROM_STANDING = new Mask("...............000001........11......");
  23     public static final Mask LOOP_FROM_DATA       = new Mask("...............000010.........0......");
  24     public static final Mask LOOP_FROM_LITERAL    = new Mask("...............000010.........1vvvvvv");
  25     public static final Mask TAKE_LOOP            = new Mask("...............000011................");
  26     public static final Mask KILL                 = new Mask("...............000100................");
  27     public static final Mask MASSACRE             = new Mask("...............000101................");
  28     public static final Mask CLOG                 = new Mask("...............000110................");
  29     public static final Mask UNCLOG               = new Mask("...............000111................");
  30
  31     public static final Mask SK                  = new Mask("...........1.........................");
  32     public static final Mask DL                  = new Mask("............1........................");
  33     public static final Mask P                   = new Mask(".............vv......................");
  34     public static final Mask P_A                 = new Mask(".............00......................");
  35     public static final Mask P_B                 = new Mask(".............10......................");
  36     public static final Mask P_Z                 = new Mask(".............01......................");
  37     public static final Mask P_ALWAYS            = new Mask(".............11......................");
  38     public static final Mask MOVE                = new Mask("...............001...................");
  39     public static final Mask TI                  = new Mask("....................1................");
  40     public static final Mask DI                  = new Mask(".....................1...............");
  41     public static final Mask DC                  = new Mask("......................1..............");
  42     public static final Mask DO                  = new Mask(".......................1.............");
  43     public static final Mask TO                  = new Mask("........................1............");
  44     public static final Mask PATH_LITERAL        = new Mask(".........................1vvvvvvvvvvv");
  45     public static final Mask PATH_DATA           = new Mask(".........................01..........");
  46     public static final Mask PATH_NOCHANGE       = new Mask(".........................00..........");
  47
  48     public static final Mask LITERAL_LO          = new Mask("...............010vvvvvvvvvvvvvvvvvvv");
  49     public static final Mask LITERAL_HI          = new Mask("...............011vvvvvvvvvvvvvvvvvvv");
  50     public static final Mask LITERAL             = new Mask("...............1..vvvvvvvvvvvvvvvvvvv");
  51     public static final Mask LITERAL_SEL         = new Mask("................vv...................");
  52     public static final Mask LITERAL_LOW_ZERO    = new Mask("...............100...................");
  53     public static final Mask LITERAL_LOW_ONE     = new Mask("...............101...................");
  54     public static final Mask LITERAL_HIGH_ZERO   = new Mask("...............110...................");
  55     public static final Mask LITERAL_HIGH_ONE    = new Mask("...............111...................");
  56     public static final Mask PUMP_NAME           = new Mask("vvvvvvvvvvv..........................");
  57
  58
  59     /** get the bits describing this box's location on the DESTINATION HORN */
  60     protected abstract long getDestAddr(Destination box);
  61
  62     /** get the bits describing this box's location on the INSTRUCTION HORN */
  63     protected abstract long getBoxInstAddr(Pump box);
  64
  65     /** given an INSTRUCTION HORN address, retrieve the corresponding Pump object */
  66     protected abstract Pump getBoxByInstAddr(long dest);
  67
  68     /** given a DESTINATION HORN address, retrieve the corresponding Pump object */
  69     protected abstract Destination getDestByAddr(long dest);
  70
  71     /** read a machine-formatted instruction from a file (into a Java object) */
  72     public Instruction readInstruction(DataInputStream is) throws IOException {
  73         long inst = 0;
  74         try {
  75             inst = (inst << 8) | (is.readByte() & 0xff);
  76             inst = (inst << 8) | (is.readByte() & 0xff);
  77             inst = (inst << 8) | (is.readByte() & 0xff);
  78             inst = (inst << 8) | (is.readByte() & 0xff);
  79             inst = (inst << 8) | (is.readByte() & 0xff);
  80             inst = (inst << 8) | (is.readByte() & 0xff);
  81             return readInstruction(inst);
  82         } catch (EOFException eof) {
  83             return null;
  84         }
  85     }
  86
  87     public Instruction readInstruction(long inst) {
  88         Pump name           = getBoxByInstAddr(PUMP_NAME.getval(inst));
  89
  90         if (UNCLOG.get(inst))   return new Instruction.UnClog(name);
  91         if (CLOG.get(inst))     return new Instruction.Clog(name);
  92         if (MASSACRE.get(inst)) return new Instruction.Massacre(name);
  93         if (KILL.get(inst))     return new Instruction.Kill(name, (int)(KILL.getval(inst)+1));
  94
  95         int predicate = 0;
  96         if (P_ALWAYS.get(inst)) predicate = Instruction.PredicatedInstruction.P_ALWAYS;
  97         if (P_A.get(inst)) predicate = Instruction.PredicatedInstruction.P_IF_A;
  98         if (P_B.get(inst)) predicate = Instruction.PredicatedInstruction.P_IF_B;
  99         if (P_Z.get(inst)) predicate = Instruction.PredicatedInstruction.P_IF_Z;
 100
 101         boolean dl = false;
 102         if (DL.get(inst))                   dl = true;
 103
 104         if (LOOP_FROM_LITERAL.get(inst))    return new Counter(name, dl, predicate, (int)LOOP_FROM_LITERAL.getval(inst),   LOOP_COUNTER);
 105         if (REPEAT_FROM_LITERAL.get(inst))  return new Counter(name, dl, predicate, (int)REPEAT_FROM_LITERAL.getval(inst), REPEAT_COUNTER);
 106         if (LOOP_FROM_DATA.get(inst))       return new Counter(name, dl, predicate, DATA_LATCH, LOOP_COUNTER);
 107         if (REPEAT_FROM_DATA.get(inst))     return new Counter(name, dl, predicate, DATA_LATCH, REPEAT_COUNTER);
 108         if (REPEAT_FROM_STANDING.get(inst)) return new Counter(name, dl, predicate, STANDING, REPEAT_COUNTER);
 109         if (TAKE_LOOP.get(inst))            return new Counter(name, dl, predicate, LOOP_COUNTER, DATA_LATCH);
 110
 111         if (LITERAL_LO.get(inst))  return new Instruction.HalfLiteral(name, dl, predicate, LITERAL_LO.getval(inst), 0, false);
 112         if (LITERAL_HI.get(inst))  return new Instruction.HalfLiteral(name, dl, predicate, LITERAL_HI.getval(inst), 0, true);
 113         if (LITERAL.get(inst)) {
 114             long literal = LITERAL.getval(inst);
 115             if      (LITERAL_LOW_ZERO.get(inst))  literal = literal << LITERAL_HIGH_ZERO.getWidth();
 116             else if (LITERAL_LOW_ONE.get(inst))   literal = (literal << LITERAL_HIGH_ZERO.getWidth()) | ~(-1L << LITERAL_HIGH_ZERO.getWidth());
 117             else if (LITERAL_HIGH_ZERO.get(inst)) literal = literal;
 118             else if (LITERAL_HIGH_ONE.get(inst))  literal = literal | (-1L << LITERAL_HIGH_ZERO.getWidth());
 119             if ((literal & (1L<<(WIDTH_WORD-1))) != 0) literal |= (-1L << WIDTH_WORD);
 120             return new Instruction.Literal(name, dl, predicate, literal);
 121         }
 122         if (FLAGS.get(inst))       return new Instruction.SetFlags(name, dl, predicate, (int)FLAGS_A.getval(inst), (int)FLAGS_B.getval(inst));
 123
 124         if (!MOVE.get(inst)) throw new RuntimeException("unknown instruction: 0x" + Long.toString(inst, 16));
 125
 126         Destination dest    = getDestByAddr(PATH_LITERAL.getval(inst));
 127         boolean tokenIn     = TI.get(inst);
 128         boolean dataIn      = DI.get(inst);
 129         boolean latch       = DC.get(inst);
 130         boolean dataOut     = DO.get(inst);
 131         boolean tokenOut    = TO.get(inst);
 132         boolean dataOutDest = PATH_DATA.get(inst);
 133         return new Instruction.Move(name,
 134                                     dl,
 135                                     predicate,
 136                                     dest,
 137                                     tokenIn,
 138                                     dataIn,
 139                                     latch,
 140                                     dataOutDest,
 141                                     dataOut,
 142                                     tokenOut,
 143                                     false,
 144                                     false);
 145     }
 146
 147     public long writeInstruction(Instruction d) {
 148         long instr = 0;
 149
 150         if (d.pump != null)
 151             instr = PUMP_NAME.setval(instr, getBoxInstAddr(d.pump));
 152
 153         boolean dl = false;
 154         if (d instanceof Instruction.PredicatedInstruction) {
 155             Instruction.PredicatedInstruction pi = (Instruction.PredicatedInstruction)d;
 156             if (pi.dl) instr = DL.set(instr);
 157             switch(pi.predicate) {
 158                 case Instruction.PredicatedInstruction.P_ALWAYS: instr = P_ALWAYS.set(instr); break;
 159                 case Instruction.PredicatedInstruction.P_IF_A:   instr = P_A.set(instr);      break;
 160                 case Instruction.PredicatedInstruction.P_IF_B:   instr = P_B.set(instr);      break;
 161                 case Instruction.PredicatedInstruction.P_IF_Z:   instr = P_Z.set(instr);      break;
 162             }
 163         }
 164
 165         if (d instanceof Instruction.CodeBagDescriptor) {
 166             Instruction.CodeBagDescriptor lc = (Instruction.CodeBagDescriptor)d;
 167             // MAJOR MAJOR FIXME: upper half here...
 168             d = new Instruction.HalfLiteral(lc.pump, dl, Instruction.PredicatedInstruction.P_ALWAYS,
 169                                             ((lc.offset << WIDTH_CODEBAG_SIZE)) | lc.size, 1, false);
 170         }
 171
 172         if (d instanceof Instruction.UnClog) {
 173             instr = UNCLOG.set(instr);
 174
 175         } else if (d instanceof Instruction.Kill) {
 176             Instruction.Kill k = (Instruction.Kill)d;
 177             instr = KILL.set(instr);
 178             instr = KILL.setval(instr, k.count);
 179
 180         } else if (d instanceof Instruction.Clog) {
 181             instr = CLOG.set(instr);
 182
 183         } else if (d instanceof Instruction.Massacre) {
 184             instr = MASSACRE.set(instr);
 185
 186         } else if (d instanceof Instruction.SetFlags) {
 187             Instruction.SetFlags sf = (Instruction.SetFlags)d;
 188             instr = FLAGS.set(instr);
 189             instr = FLAGS_A.setval(instr, sf.flag_a);
 190             instr = FLAGS_B.setval(instr, sf.flag_b);
 191
 192         } else if (d instanceof Instruction.Literal) {
 193             long il = ((Instruction.Literal)d).literal;
 194             long literal = ((Instruction.Literal)d).literal;
 195             long allones = ~(-1L << WIDTH_WORD);
 196             il = literal = literal & allones;
 197             if      (((il &  (-1L << 19)) & allones) == 0)       instr = LITERAL.setval(LITERAL_HIGH_ZERO.set(instr), il);
 198             else if (((il | ~(-1L << 19)) & allones) == allones) instr = LITERAL.setval(LITERAL_HIGH_ONE.set(instr),  il & ~(-1L<<19));
 199             else if (((il & ~(-1L << 19)) & allones) == 0)       instr = LITERAL.setval(LITERAL_LOW_ZERO.set(instr), il >> 19);
 200             else if (((il |  (-1L << 19)) & allones) == allones) instr = LITERAL.setval(LITERAL_LOW_ONE.set(instr),  (il >> 19));
 201
 202         } else if (d instanceof Instruction.HalfLiteral) {
 203             Instruction.HalfLiteral inst = (Instruction.HalfLiteral)d;
 204             if (inst.pump != null) {
 205                 if (inst.high) {
 206                     instr = LITERAL_HI.set(instr);
 207                     instr = LITERAL_HI.setval(instr, inst.literal);
 208                 } else {
 209                     instr = LITERAL_LO.set(instr);
 210                     instr = LITERAL_LO.setval(instr, inst.literal);
 211                 }
 212             } else {
 213                 instr = inst.literal;
 214             }
 215
 216         } else if (d instanceof Instruction.DecrLoop) {
 217             instr = DL.set(instr);
 218
 219         } else if (d instanceof Instruction.Counter) {
 220             Instruction.Counter ic = (Instruction.Counter)d;
 221             if      (ic.dest == DATA_LATCH && ic.source == LOOP_COUNTER)   instr = TAKE_LOOP.set(instr);
 222             else if (ic.dest == LOOP_COUNTER && ic.source == DATA_LATCH)   instr = LOOP_FROM_DATA.set(instr);
 223             else if (ic.dest == REPEAT_COUNTER && ic.source == DATA_LATCH) instr = REPEAT_FROM_DATA.set(instr);
 224             else if (ic.dest == REPEAT_COUNTER && ic.source == STANDING)   instr = REPEAT_FROM_STANDING.set(instr);
 225             else if (ic.dest == REPEAT_COUNTER)                            instr = REPEAT_FROM_LITERAL.setval(REPEAT_FROM_LITERAL.set(instr), ic.source);
 226             else if (ic.dest == LOOP_COUNTER)                              instr = LOOP_FROM_LITERAL.setval(LOOP_FROM_LITERAL.set(instr), ic.source);
 227             else throw new RuntimeException();
 228
 229         } else if (d instanceof Instruction.Move) {
 230             Instruction.Move inst = (Instruction.Move)d;
 231             instr  = MOVE.set(instr);
 232             if (inst.tokenIn)                    instr = TI.set(instr);
 233             if (inst.dataIn)                     instr = DI.set(instr);
 234             if (inst.latch)                      instr = DC.set(instr);
 235             if (inst.dataOut)                    instr = DO.set(instr);
 236             if (inst.tokenOut)                   instr = TO.set(instr);
 237             if (inst.dataOutDest)                instr = PATH_DATA.set(instr);
 238             else {
 239                 instr  = PATH_LITERAL.set(instr);
 240                 instr  = PATH_LITERAL.setval(instr, inst.dest==null?0:getDestAddr(inst.dest));
 241             }
 242
 243         } else {
 244             throw new RuntimeException("unrecognized instruction " + d);
 245
 246         }
 247         return instr;
 248     }
 249
 250     public void writeInstruction(DataOutputStream os, Instruction d) throws IOException {
 251         long instr = writeInstruction(d);
 252         for(int i=5; i>=0; i--)
 253             os.write(getIntField(i*8+7, i*8, instr));
 254    }
 255
 256 }